Submission #824641

#	Time	Username	Problem	Language	Result	Execution time	Memory
824641		tomruk	Rectangles (IOI19_rect)	C++17	49 / 100	857 ms	679188 KiB

rect

#include "rect.h"
#include <bits/stdc++.h>
#define N 705
using namespace std;
short dwn[N][N];
short rght[N][N][N];
long long count_rectangles(vector<vector<int>> a){
	long long ans = 0;
	int n = a.size();
	int m = a[0].size();
	for(int i = m-1;i>=0;i--){
		for(int j = 0;j<n-1;j++){
			int maxi = a[j+1][i];
			for(int c = j+2;c<n && maxi < a[j][i];c++){
				if(maxi >= a[c][i])
					continue;
				rght[j][i][c] = 1;
				rght[j][i][c] += rght[j][i + 1][c];
				maxi = a[c][i];
			}
		}
	}
	int cnt = 0;
	for(int i = n-1;i>0;i--){
		for(int j = 0;j<m-1;j++){
			int maxi = a[i][j+1];
			for(int c = j+2;c<m;c++){
				if(maxi >= min(a[i][c],a[i][j])){
					dwn[j][c] = 0;
					continue;
				}
				cnt++;
				dwn[j][c] += 1;
				maxi = max(maxi,a[i][c]);
			}
			for(int c = j+2;c<m;c++){
				for(int d = i + 1;d <= i + dwn[j][c];d++){
					ans += (j + 1 + rght[i-1][j+1][d]) >= c; 
				}
			}
		}
	}
	assert(cnt <= n * m);
	return ans;
}

• Subtask 1: 8 / 8
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 22 / 22
• Subtask 5: 0 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28